1.5k citations · 7.6k across the 45 of their papers we have counts for
6 papers · 1 filter
Nonnegative Matrix Factorization (NMF) with Heteroscedastic Uncertainties and Missing data
Guangtun Zhu
Dimensionality reduction and matrix factorization techniques are important and useful machine-learning techniques in many fields. Nonnegative matrix factorization (NMF) is particul…
Hydrogen Emission from the Ionized Gaseous Halos of Low Redshift Galaxies
Huanian Zhang, Dennis Zaritsky, Guangtun Zhu +2
Using a sample of nearly half million galaxies, intersected by over 7 million lines of sight from the Sloan Digital Sky Survey Data Release 12, we trace H + [N{\small II}] emiss…
The Astropy Problem
Demitri Muna, Michael Alexander, Alice Allen +151
The Astropy Project (http://astropy.org) is, in its own words, "a community effort to develop a single core package for Astronomy in Python and foster interoperability between Pyth…
Do galaxy global relationships emerge from local ones? The SDSS IV MaNGA surface mass density-metallicity relation
Jorge K. Barrera-Ballesteros, Timothy M. Heckman, Guangtun B. Zhu +12
We present the stellar surface mass density {\it vs.} gas metallicity () relation for more than 500,000 spatially-resolved star-forming resolution elements (spaxels) from a…
The evolution of the [OII], Hβ and [OIII] emission-line luminosity functions over the last nine billions years
Johan Comparat, Guangtun Zhu, Violeta Gonzalez-Perez +12
Emission line galaxies are one of the main tracers of the large-scale structure to be targeted by the next-generation dark energy surveys. To provide a better understanding of the…
A New View of Classification in Astronomy with the Archetype Technique: An Astronomical Case of the NP-complete Set Cover Problem
Guangtun Zhu
We introduce a new generic Archetype technique for source classification and identification, based on the NP-complete set cover problem (SCP) in computer science and operations res…